Wallhaven - Your source for the best high quality wallpapers on the Net!
HDwallpapers.net - HDwallpapers.
InterfaceLIFT - High-resolution widescreen wallpapers, desktop icons, and themes for Mac OS X, Microsoft Windows...
Simple Desktops - A collection of wallpapers designed to make your computer beautiful without distraction.
Desktoppr - Desktoppr has one of the longest histories of desktop based wallpapers, images and background offering services over the internet.
WallpaperFusion - The best multi-monitor and Eyefinity wallpaper images, all in one place!